SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd37cf18e6cd85ff9896e3c2620aea5f374f900960efa9a8c156f2506b0e6401e' 
  AND token = 'BIEr+bHP5bUG3CAj/3XmIh0x316jYQHEl6xqNPHYvVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}